Never even heard of it. The one Dick novel I possess is Galactic Pot-Healer, which is quirky and fun (but not shallow). I've read quite a lot of his stuff, but apart from the obvious Blade Runner and more recent films, I had to check the quite surprising wikipedia article to remember the titles.

The Man in the High Castle is one of the foremost. It posits an alternate WWII in which Germany and Japan win and partition America, and plays with (I should say, explores seriously) the nature of reality. I recall the I Ching playing a significant role. Must get hold of it again!

I've read Do Androids Dream of Electric Sheep? It was pretty good, though I preferred Blade Runner. While a lot got changed for the film, reading the book still explained a lot about the world, such as the artificial animals.

__________________Much of MADNESS, and more of SIN, and HORROR the soul of the plot.

I tried "A Scanner Darkly" but couldn't get through it. I found the parallels to the 1970s USA drug war too close; there wasn't enough sci-fi for me. But other people like it. I liked "Do Androids Dream of Electric Sheep?" when I was a kid. I've been meaning to check out more by him but haven't. I've seen several movies based on his works: Blade Runner, Total Recall, Minority Report, and Paycheck. There was also a short-lived syndicated TV series called "Total Rekall 2050" that blended elements from Blade Runner and Total Recall.

Wired ran an article on him a few years ago, where I first learned of his mentall illness. I knew he had had a stimulant addiction because he wrote about it in the endnote to "A Scanner Darkly".